Process for producing a liquid insecticide containing effective ingredient of derrisspecies



Patented Feb. 4, 1930 I PROCESS FOR PRODUCING A UNITED: STATES, PATENT OFFICE TOSHIO OHOBI AND KIYOSHI NAKAZAWA, OF TOKYO, JA PAN, ASSIGNORS TO ZAIDAN HO-TIN -RIKAGA'KU KENKYUJO, F TOKYO, JAPAN 1 1% Drawing. l mam filed February 10. 1928, Serial No. 253x26, and in Japan February 18, 1927.

This invention relates to a process ior 'p'roducing a liquid insecticide containing the effective ingredient of the derris species, WhlCh comprises formin a primary material in which the effective ingredient is mlxed with material such as oils, fats, waxes, resins,-

' higher alcohols, highenhydrocarbons, higher fatty acids, etc. which are entirely free from water and alkali together with an anhydrous solvent such as benzol, carbon tetrachloride, or trichlor ethan, and mixing the primary material with a soap solution to'form a colloidal solution. The object of the invention is to facilitate the emulsionizing of theprod- J not when the primary material is mixed with a soap solution in use, as well as to preserve the activity of the eflective ingredient.

In the specification of the'previous patent application U. S. Serial. No. 53,743, there is described a process for producing aliquid insecticide containing the effective, ingredient of derris species, which comprises forming'a primary material in which'the efl'ective ingredient is mixed with an anhydrous and alkali free material such-asoils, fats, waxes, resins, higher alcohols, higherhydrocarbons,

higher fatty acids, etc., which are entirely r free from water and alkali, and the primary material then mixed with a soap solu-' 'tion to form a colloidal solution. The present invention is an improvement of the above process and. is characterizedin that,

i to' the primary material, an anhydrous sol- --vent such as benzol, carbon tetrachloride or trichlofi ethan is added. By this addition 0 the anhydrous solvent; the formation of the final product, that is, the colloidal solutio is remarkably facilitated so that, when 't e primary material containing the anhydrous solvent is mixed with a soap solution,- a good emulsion is almost, instantly formed without necessitating any hot water or other heat energy. p

of powdered To 100 grams derris root, 10

litres of ether are added. to extract the ef-' mfective ingredient of the derris root after extraction is complete, thewhole or'greater part of the other is evaporated and-recovered.

f containin I In testimony whereof we afiix Itures.

the residual effective ingredient a mixtureof 150 grams of anhydrous and alkali free fish oil and 150 rams of benzol (as the anhydrous solvent are added, so that a solution of'theefiective ingredient in benzol results. This is the improved primary ma;

terial.

LIQUID INSECTICIDE CONTAINING EFFECTIVE INGREDI- 'EN'I. OF DEBRIS SPECIES The soap solution is easilyprepared by, for

instance,

kilograms of Water. The solution is mixed to the improved primary ,inaterial inv use.

' 1 Example H To 1 kilogram of powdered derris root, 5 kilograms of benzol are added and the effective ingredient of the derris root is extracted while warming the benzol. The ben- T adding 500 grams of seap'to 100- zol is recovered by evaporation. To the resiolual efiective ingredient, a mixtureof 600 grams of anhydrous and alkali free fish oil and 600 grams ofcarbon tetrachloride (as the Also in the two exam les given, thelimproved primary materia can be easily prepared in the form of powder when'800 grams of anhydrous gum arabic are added.

Claim: A process for producing the effective ingredient of derris species, w ichcomprises forming a primary aIiqi-nd-insecticide material-in which the efiective ingredient is mixed with an anhydrous and alkali free material of an oily nature and diss'olvedin an anhydrous solvent such 'as benzol, carbon tetrachloride ortrichlor-ethan, and then mixing the fprimary material with a soap solu tion to. rm a colloidal solution..

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our signa-" 

